# Relationship history for MSHA mine 4605984

Current hierarchy: **Farkas Andrew → Farkas Coal Company → Marion #4 Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Brooks Arthur E & Ronald G → Marion #4 Strip; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & F Coal Company → Marion #4 Strip; 1979-04-01 to 1980-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Brooks Arthur E & Ronald G → B & F Coal Company; 1979-04-01 to 1980-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Farkas Andrew Et Al → Marion #4 Strip; 1979-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Farkas Coal Company → Marion #4 Strip; 1980-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farkas Andrew Et Al → Farkas Coal Company; 1980-04-03 to current/open; source msha-controller-operator-history